Preheat the oven to 300Â° F.
Butter a 13 x 9 x 2 inch casserole.
Drain the sweet potatoes and slice them lengthwise.
Place the sweet potatoes in the prepared casserole.
Combine the butter, brown sugar, cinnamon, nutmeg, cloves, lemon rind, lemon juice, and sherry in a saucepan.
Heat until the butter melts and the sugar dissolves.
Add salt and pepper to taste.
Pour the mixture over the sweet potatoes.
Bake at 300Â° F for 30 minutes.